This work points to the interdependence that exists between the Association, as the most widespread shapes of non-profit organizations and the system of financing public needs as most buoyant financiers Association. This work extensive display system of financing public needs, legal regulations for that area, and in particular public expenditure as a key instrument for public needs. Explained the principles, characteristics, theory, structure and classification of public expenditure .. The paper detailed theorizing about organizations as the most common form of interest association of the public, with special emphasis on the legislation regulating the work of NGOs and the Office for Cooperation with the Croatian Government. After public expenditure and associations in the paper deals with the financing of NGOs from public finances on a concrete example of the Club adventure sports baraber extreme team, the association for sports in nature and ecology.